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/************************************************************************
************************************************************************
FAUST compiler
Copyright (C) 2003-2018 GRAME, Centre National de Creation Musicale
---------------------------------------------------------------------
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
************************************************************************
************************************************************************/
/*****************************************************************************
******************************************************************************
LIST
Y. Orlarey, (c) Grame 2002
------------------------------------------------------------------------------
This file contains several extensions to the tree library :
- lists : based on a operations like cons, hd, tl, ...
- environments : list of associations (key value)
- property list : used to annotate trees
API:
----
List :
-----
nil = predefined empty list
cons(x,l) = create a new list of head x and tail l
hd(cons(x,l)) = x,
tl(cons(x,l)) = l
nth(l,i) = ith element of l (or nil)
replace(l,i,e) = a copy of l where the ith element is e
len(l) = number of elements of l
isNil(nil) = true (false otherwise)
isList(cons(x,l)) = true (false otherwise)
list(a,b,..) = cons(a, list(b,...))
lmap(f, cons(x,l)) = cons(f(x), lmap(f,l))
reverse([a,b,..,z]) = [z,..,b,a]
reverseall([a,b,..,z]) = [ra(z),..,ra(b),ra(a)] where ra is reverseall
Set :
-----
(Sets are implemented as ordered lists of elements without duplication)
isElement(e,s) = true if e is an element of set s, false otherwise
addElement(e,s) = s U {e}
remElement(e,s) = s - {e}
singleton(e) = {e}
list2set(l) = convert a list into a set
setUnion(s1,s2) = s1 U s2
setIntersection(s1,s2) = s1 intersection s2
setDifference(s1,s2) = s1 - s2
Environment :
-------------
An 'environment' is a stack of pairs (key x value) used to keep track of lexical bindings
pushEnv(key, val, env) -> env' create a new environment
searchEnv(key,&v,env) -> bool search for key in env and set v accordingly
search(k1,&v, push(k2,x,env)) = true and v is set to x if k1 == k2
= search(k1,&v,env) if k1 != k2
Property list :
---------------
Every tree can be annotated with an 'attribut' field. This attribute field
can be used to manage a property list (pl). A property list is a list of pairs
key x value, with three basic operations :
setProperty(t, key, val) -> t add the association (key x val) to the pl of t
getProperty(t, key, &val) -> bool search the pp of t for the value associated to key
remProperty(t, key) -> t remove any association (key x ?) from the pl of t
Warning :
---------
Since reference counters are used for garbage collecting, one must be careful not to
create cycles in trees. The only possible source of cycles is by setting the attribut
of a tree t to a tree t' that contains t as a subtree.
History :
---------
2002-02-08 : First version
2002-02-20 : New description of the API, non recursive lmap and reverse
2002-03-29 : Added function remElement(e,set), corrected comment error
******************************************************************************
*****************************************************************************/
#ifndef __LIST__
#define __LIST__
#include <stdio.h>
#include "symbol.hh"
#include "tree.hh"
// Basic List Operations implemented on trees
typedef Tree (*tfun)(Tree);
void print(Tree t, FILE* out = stdout);
// to create new lists
Tree cons(Tree a, Tree b);
Tree list0();
inline Tree list1(Tree a)
{
return cons(a, list0());
}
inline Tree list2(Tree a, Tree b)
{
return cons(a, list1(b));
}
inline Tree list3(Tree a, Tree b, Tree c)
{
return cons(a, list2(b, c));
}
inline Tree list4(Tree a, Tree b, Tree c, Tree d)
{
return cons(a, list3(b, c, d));
}
// to access the head and the tail of a list
inline Tree hd(Tree l)
{
return l->branch(0);
}
inline Tree tl(Tree l)
{
return l->branch(1);
}
// predicates
LIBFAUST_API bool isNil(Tree l);
bool isList(Tree l);
// predicates
Tree nth(Tree l, int i);
Tree replace(Tree l, int i, Tree e);
int len(Tree l);
// reversing
Tree reverse(Tree l);
Tree reverseall(Tree l);
// operations
Tree rconcat(Tree l1, Tree l2);
Tree concat(Tree l1, Tree l2);
Tree lrange(Tree l, int i, int j); // from i to j excluded
// mapping
Tree lmap(tfun f, Tree l);
// Sets
bool isElement(Tree e, Tree l);
Tree addElement(Tree e, Tree l1);
Tree remElement(Tree e, Tree l1);
Tree singleton(Tree l);
Tree list2set(Tree l);
Tree setUnion(Tree l1, Tree l2);
Tree setIntersection(Tree l1, Tree l2);
Tree setDifference(Tree l1, Tree l2);
// Pairs
// inline Tree pair (Tree t1, Tree t2) { return cons(t1,t2); }
inline Tree left(Tree t)
{
return t->branch(0);
}
inline Tree right(Tree t)
{
return t->branch(1);
}
// Environment : stack of pairs key value)
// Tree pushEnv(Tree key, Tree val, Tree env=gGlobal->nil);
Tree pushEnv(Tree key, Tree val, Tree env);
bool searchEnv(Tree key, Tree& v, Tree env);
// Operations on the property list of a tree t
void setProperty(Tree t, Tree key, Tree val);
bool getProperty(Tree t, Tree key, Tree& val);
void remProperty(Tree t, Tree key);
// Mapping sur les arbres
Tree tmap(Tree k, tfun f, Tree t);
// remplacement
Tree substitute(Tree t, Tree id, Tree val);
#endif
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